Gaining head



March 28, 1933. T. J. JOHNSON 1,903,002

GAINING HEAD Filed Sept. 6,- 1928 gnuwntor flonajj%alwon MW- W Patented Mar. 28, 1933 UNITED STATES moms JonnsoN, orrnmn mcnrean GAINING HEAD applieation filed September e, 1928. *se ialneisoesoa.

This invention relates to gaining heads, and it is an object of the invention to provide a gaining head which may be adjusted to inv crease or decrease either its width or its diameterso as to compensate for wear of the cutting tools carried by the head or to vary either the width or depth of the notches or grooves cut thereby.

It is a furtherobject of the invention to provide-a aining head so constructed and .arranged t at the above-mentioned adjustments may be made without removing the head from the spindle on which it is mounted and without the use of shims or expansion collars.

Other and important objects of the invention will be apparent from a perusal of the following specification in connection with the accompanying drawing wherein is described and showna preferred embodiment of my invention. 1

In the drawing: g

Figure 1 is an end elevatiomwith parts broken away and in section, of my gaining head mounted on a spindle.

Figure 2 is a section on the line 22 of Fi ure 1. l a

Figure 3 is aview of the inner face of the male member of my gaining head.

Figure 4 is a view of the outer face of the female member of my gaining head.

' Figure 5 is an elevation of an'adjusting key adapted to be used in connection with my gaining head. A i s Figure 6 is an enlarged fragmentary section showing the details of the mounting of one of the edge cutting tools. L

As shown in the drawing, the body of my gaining head'is made of two parts, a male part 10 and afemale part 11. The part 10 may be described as consisting of a circular member of suitable material, preferably forged steel, from which have been removed two diametrically opposite portions of substantially 90 ring sectoral shape, soas to leave twodiametrically opposite outwardly projecting portions 12 of substantially the same shape as the removed portions, and whichhas formed on one side thereof and integral therewith a frusto-conical reinforcing axial with the recess 14.

and strengthening portion 13 whose maximum diameter issomewhat greater than the inner diameter of the'removed portions. In-

to the face. of the member 10 opposite that on which the reinforcement 13 is formed there extends a circular recess 14: coaxial with the member and a circular counter-recess 15 whose diameter is equal to the innerdiameter of the removed portions and'which is '00- g r p I 6 The member 11 is similar to the member 10, V as thus far described, and thesame reference characters have been applied thereto.

From the bottom of the recess 14 and coup axial and integral with the member 10, there extends a cylindricalboss l6 through whichv and the 'member extends an axial bore 17. The end of the boss adjacent the bottom of the recess isslightly larger than the outer end thereof and is screw-threaded for a. purpose '70 which will be apparent.

The reference character 18 indicatesa circular disk of suitable material whose'thickness is slightly less than the total depth of the recesses l le in the memberslO and 11, and which is slightly smaller in diameter than the recesses 14. The disk 18 has therethrough an internally threaded axial bore 19 of substantially the same diameter .as the outer end of the boss 16 and has formed on its circumference gear teeth 20.

i Extending through the member 11 andcoaxial therewith is a bore 21 whosediameter is slightly larger thanthat of the outer end of the boss 16. Smaller bores 22, which are located atsuch a'distance from the center of the member 11 as to be externally tangent to a circle described about the axis of the member as a center and having a diameter substantially equal to that of the root circle of the gear 18, also. extend through the member 11. 7 r

- On the outer faces of the outwardly proj ecting portions 12 of each of thememberslO and 11 there are provided two diametrically opposite radial grooves 28 extending outwardly to the circumference thereof and on the opposite faces of the portions 12 and in registration with the grooves 23 two elon-'- gated recesses 24. In each of the grooves is 10 engagement with the bolts, The tools obviously may be adjusted radially by loosen-V ing the nuts 28 and moving them inwardly.-

or outwardly in the groovesv 23;

A slot 29 which is inclined with respect to the axis of the member, and also inclined in the direction of rotation of the head, extends intoeach of the portions 12 of the members 10 and 11 from the circumference thereof. As is clearly shown in the drawing, the direction of inclination of the slots 29 in the members 10 and 11 with respect to the axes thereof is such that when the members are assembled, as hereinafter described, the slots in the member 10 are inclined oppositely to those in the member 11 with respect to the axis of the head. Parallel with each of thelslots 29 and outwardly thereof is a bore 30 which opens into the adjacent slot throughout the length thereof and is counter-bored at its outer end. The outer end of the side of the slot 29, opposite that on which the bore 30 is located, opens into a recess 31 having a side wall inclined outwardly with respect to the side walls of the slot. In each of the slots29 is located a cutting tool or knife 32 having a sharpened outer end. In each of the bores 30, and having its head located in the counter-bore at'the outer end thereof, is a screw "33 on which is threaded a lifter 34 having a portion projecting into theslot 29 and bearing against the rear end of the knife 32. In each of the recesses 31and having one side parallel to and bearing-against the adjacent side of the tool 32, and the opposite side parallel to and bearing against the inclined wall of the recess 31 is a wedge 35 through which and threaded into the portion 12 extends a screw 36, having its head located in a counter-bore in the wedge, and which is adapted to draw the wedge into the recess and thus hold the knife in position in the slot. o r

The tool 32, it is obvious, may be adjusted in the slot 29 by unscrewing the screw 36 so as to loosen the wedge .35, and then, moving 1 the lifter 34 outwardly or inwardly by means of the screw 33 so as to move the'tool outwardly or allow it'to be moved inwardly, and

then tightening the screw .36 so as to jam the wedge against the side of the tool and the inclined side of the recess 31 in order to secure the tool in adj usted position. v a

' The members 10, 11 and 18 are adapted to be assembled, as shown in the drawing, with f the boss 16 of the member 10 extending positioned between the members 10 and 11 through the bore 21 in the member 11, with the portions 12 of the members 10 and 11 in interfitting relation so as to form a substantially circular head,'and with the member 18 and located partially in each of the recesses 14 and in screw-threaded engagement with the boss 16. i

When the parts of the gaining head are thus assembled, the head is adapted to be mounted on a conventional type of spindle, such. as that indicated at 37, which has a reduced portion 38, and a collar 39 on the reduced portion, bearing at one end against the shoulder between the reduced and enlarged portions of the spindle. The gaining head is adapted tobe mounted on the spindle 37 as shown in Figures 1 and 2, with the reduced end of the spindle extending through the bore 17 in the boss 16, and with the outer end of the collar 39 bearing'ag'ainSt the outer face of the member 10, and is adapted to be secured thereonby a nut 40 screwthreaded on the outer end of the reduced portion of the spindle-and bearing against the outer face of the member 11, through the intermediary of a collar 41 which surrounds the portion of theboss 16 which'projects beyond the outer face of the member 11. H m

It will be noted that when the members 10,

11 and 18 are assembled as shown in the drawing and hereinbefore described, teeth of the gear 18 extend into the inner ends of the bores 22. As shown in Figures 2 and 5, there 00 is provided a key 42 having formed, on one end thereof a handle 43, and on theopposite 7 end thereof, which is adapted toenter one 7 of the bores 22, gear teeth 44 adapted to mesh with the teeth 20 on the gear18." I

It'will now be obvious thatltoi adjust my gaining head so as to increase or decrease its width, it .is only necessary to loosen the nut 40, insert the toothed end of the key 42 in one of the bores 22 so that the teeth thereon .5 mesh with teethon'the gear 18, turn the key 7 by means of the handle 43 so as to cause rotation of the gear 18 and cause it to: move outwardly or inwardly on the boss 16, and thus farther separate themembers 10 and 11 31115 axially'or allow them to be moved closer together axially when-the'nut 40 is subsequent- 1y tightened. It will be obviousthat when the members 10 and 11 are farther separated axially the width of the slot out by the head will be increased, and when they are moved closer together axially the width of the S10 cut by the head will-be decreased. 7

Though I have shown and described a preferred embodiment of my invention, it is 5 to be understood that this has been done merely by way of example andnot with the intention of limiting my invention thereto, and that the scope of my invention is limited only M by the appended claim.' 1 V I claim:

In a device of the class described, a body portion including two parts each of which includes a substantially circular central portion, diametrically opposite projections extending outwardly from each of the central portions and adapted to interfit with the projections on the other central portion to form a substantially circular head, axial recesses formed in the juxtaposed facesof the two central portions, a boss extending axially from one of said central portions and into an axial bore in the other of said central por-' tions, an adjusting member located in said recesses and in screw-threaded engagement with said boss, gear teeth on the periphery of said adjusting member, and a bore through one of said central portions through which a key having gear teeth thereon is adapted to be inserted to engage the teeth thereof with the teeth on the ad usting member to adjust the two parts of the'body portion axially.

In testimony whereof I affix my signature.

THOMAS J. JOHNSON; 

